audio fluctuation in a tape cassette

I recorded a tape cassette. Now the problem is that the tape is old, and the audio is fluctuating in volume. 2 seconds normal, 2 seconds lower volume.
Is there any way I can automatically (more or less) fix it thorough out the whole recording?
I attach a sample of the wave form of this recording.

You could click in the name of the track, Split Stereo Track, then try Compressor or Limiter on the Left channel. But it would be better if we could hear a sample in case there is more wrong than just volume. See How to post an audio sample.


Here is a short sample. Most of the cassette is talking but you can hear the fluctuations best in the song.